Scale



L. JAENICHEN Feb. 25, 1930.

SCALE Filed May 19, 1926 INVENTOR.

ATTORNEY.

Patented Feb. 25, 1930 UNITED STATES PATENT OFFICE LOUIS JAENICHEN, OFSPRINGFIELD TOWNSHIP, OAKLAND COUNTY, MICHIGAN, AS-

SIGNOR TO THE STANDARD COMPUTING SCALE COMPANY, OF DETROIT, MICHIGAN,

A CORPORATION OF MICHIGAN SCALE Application filed May 19,

The present invention relates to scales and particularly to computingplatform scales. Heretofore computing platform scales of the compoundlever type have been more or less inaccurate due to the difliculty of soconstructing the scale that the platform in its movement under the loadwould remain parallel to itself. This has been neutralized in one knowntype of scale by so constructing the levers, springs etc., that theplatform has very little movement and the indicator pinion accordinglymade very small. Such a construction is open to the objection that theparts must be very accurately made and some 'of the parts consequentlymore or less delicate.

The present invention has among its obj ects to overcome theseobjections and provide a scale-0f this type in which the platform mayhave a considerable movement and remain substantially parallel to itselfthroughout and consequently the indicator parts may be made sufiicientlylarge to stand rough usage and not require extremely accurateworkmanship, yet the scale Will be accurate in its operation.

Other objects will readily appear to those skilled in the art uponreference to the following description and drawing in which Fig. 1 is aside elevation of the working parts of the scale.

Fig. 2 is an end el vation thereof from the right of Fig. 1.

Fig. 3 is a diagrammatic illustration of the action of certain parts ofthe mechanism. 5 In the drawings, the lever housing is shown at 10 withan upright casing 11 at one end thereof.

The platform 12 is provided with legs 13 and 14 extending down into thehousing 10 and resting on the main levers 15 and secondary levers 16respective. The main levers 15 are pivoted upon the arms 17 secured tohousing 10 and extend to the rear of the latter to a point under casing11 where their face ends are supported by springs 18. The latter extendupward into the casing 11 and are attached at their upper ends to anequalizing bar 19 supported pivotally upon an adjustable stud 20 carriedin an arm 21 forming part of casing 11. Springs 18 are connected tomainv 1926. Serial No. 110,162.

levers 15 close to the ends of the latter through suitable knife edgepivots 22.

Secondary levers 16 are supported, by means of suitable knife edgepivots 25, at one end by the main levers 15 through links 26 and attheir other ent s by links 27 which latter extend up through casing 11to near the extreme upper end thereof where they are provi led with eyes28 adapted to hook over the hooks 29 formed within the casing head.

The extreme end of one of the levers 15 has secured thereto a rod 35provided at its upper end with a rack 36 adapted to. coact with a pinion37 carried upon a rotatable shaft 38 to which is secured a pointer 39 infront of a dial lO provided with suitable indications.

In the operation of the scale, it should be noted that, as the legs 13and 14 are fixed rigidly to the platform 12, and, as leg 13 on its pivotmoves on the arc of a circle having its center at the pivot on arm 17,the lower end of leg 1 must move laterally a short distance with leg 13.Consequently, lever 16 must move longitudinally whenever the platform 12moves vertically. For this reason, lever 16 must be supported on linkspermitting such movement.

However, in scales of this type as usually constructed, lever 16 issupported upon two links of about the length of link 26, the one at therear end of the lever being swung from the housing. This arrangement, onaccount of the angular movement of the latter link and its short radius,say for example about two inches, causes an upward movement of its endof lever 16, thereby opposing the downward mov ment of the platform.This action therefore seriously interferes with the accuracy of thescale. It also tends to bind the pivot.

In the present construction, link 27 is constructed of such length thatthe are through which its lower end swings it so flat as to be tointents and purposes a horizontal line and the downward movement ofplatform 12 is not opposed to any noticeable degree by the relativeupward movement of lever 16.

The arcs referred to are shown in comparison in Fig. 3. In this figurethe are A represents the travel of the lower end of the known link andthe arc B that of link 27. These arcs are somewhat longer than thoseactually travelled but it will be noted that while the vertical distanceof the ends of arc B from a true horizontal line is hardly detectable,the vertical distance of the ends of are A from the horizontal isapproximately an m eighth of an inch.

ow having described the invention and the preferred form of embodimentthereof it is to be noted that the said invention is not to be limitedto the s cific details herein set forth but only by tle scope of theclaims which follow.

I claim 1. In a compound lever platform scale having an upright casingat one end of the platform housing, a main lever, a secondary leversupported at one end upon said main lever and at its other end by a linkextending up into and supported by said upright casing.

2. In a compound lever platform scale having an upright casing at oneend of the platform housing, a main lever, and a secondary leversupporting the platform, said secondary lever being supported at one endby said main lever, and means for supporting the other end of saidsecondary lever said means being of suflicient length and so arranged asto ermit longitudinal movement of said sec? ary lever in a substantiallyhorizontal pat 85 3. In a compound lever platform scale having anupright casing at one end of the platform housing, a main lever, and asecondary lever supporting the platform,. said secondary lever beingsupported at one end by said main lever, and means for supportin theother end of said secondary lever sai means being adapted to permitlongitudinal movement of said secondary lever 1n a substantiallyhorizontal path, said means consisting of a link pivotally connected tosaid secondary lever and supported from the top of said upright casing.

LOUIS JAENICHEN.

